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LM7805 Datasheet(PDF) 19 Page - Texas Instruments

Part No. LM7805
Description  1.5-A Fixed Voltage Regulators
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM7805 Datasheet(HTML) 19 Page - Texas Instruments

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LM340, LM340A, LM7805, LM7812, LM7815
www.ti.com
SNOSBT0K – FEBRUARY 2000 – REVISED JULY 2016
Product Folder Links: LM340 LM340A LM7805 LM7812 LM7815
Submit Documentation Feedback
Copyright © 2000–2016, Texas Instruments Incorporated
Heat Sinking DDPAK/TO-263 and SOT-223 Package Parts (continued)
As shown in Figure 29, increasing the copper area beyond 1 square inch produces very little improvement. It
should also be observed that the minimum value of θ(J–A) for the DDPAK/TO-263 package mounted to a PCB is
32°C/W.
As a design aid, Figure 30 shows the maximum allowable power dissipation compared to ambient temperature
for the DDPAK/TO-263 device (assuming θ(J–A) is 35°C/W and the maximum junction temperature is 125°C).
Figure 30. Maximum Power Dissipation vs TAMB for the DDPAK/TO-263 Package
Figure 31 and Figure 32 show the information for the SOT-223 package. Figure 31 assumes a θ(J–A) of 74°C/W
for 1-oz. copper and 51°C/W for 2-oz. copper and a maximum junction temperature of 125°C.
Figure 31. θ(J–A) vs Copper (2 Ounce) Area
for the SOT-223 Package
Figure 32. Maximum Power Dissipation vs
TAMB for the SOT-223 Package
See AN-1028 LMX2370 PLLatinum Dual Freq Synth for RF Pers Comm LMX2370 2.5GHz/1.2GHz (SNVA036)
for power enhancement techniques to be used with the SOT-223 package.


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